The Tenergy 12.8V 40Ah LiFePO4 Battery Pack PCB combines high energy density with advanced safety features. Its lithium iron phosphate chemistry provides 2,000+ cycles at 80% capacity retention, while the built-in PCB protects against overcharge, over-discharge, and short circuits. Ideal for solar storage, marine applications, and power tools, it operates in -20°C to 60°C environments with a 10-year design lifespan.
How to Prevent Lithium-Ion Battery Fires and Explosions
What Safety Features Does the Integrated PCB Provide?
The multi-layer PCB includes:
1. Over-voltage protection (16V cutoff)
2. Under-voltage lockout (9.5V recovery)
3. Short-circuit protection (＞150A cutoff in 200μs)
4. Temperature monitoring (±2°C accuracy)
5. Cell balancing (＜50mV deviation)
These features reduce failure risks by 82% compared to unprotected lithium batteries while enabling series/parallel configurations up to 4S4P without external BMS.
The integrated protection circuit employs three-stage fault detection with automatic recovery protocols. During lab testing, the PCB demonstrated 99.7% success rate in preventing thermal runaway when subjected to 150% rated current for 15 seconds. Its balancing algorithm actively redistributes energy during both charging and discharging cycles, maintaining cell voltage variance below 30mV even after 500 consecutive cycles. For critical applications, the system supports daisy-chaining up to 4 units while maintaining individual pack protection through isolated communication channels.
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| Protection Feature | Activation Threshold | Response Time |
|---|---|---|
| Overcharge | 15.6V ± 0.2V | ＜2 seconds |
| Deep Discharge | 10.0V ± 0.5V | Immediate cutoff |
| High Temp | 75°C ± 3°C | ＜500 milliseconds |
How Does Temperature Affect Performance and Longevity?
Between -20°C to 45°C, the battery delivers 100% rated capacity. At -30°C, capacity drops to 65% but recovers when warmed. High-temperature cycling (50°C+) accelerates capacity fade to 15% per 500 cycles versus 5% at 25°C. The PCB’s thermal cutoff activates at 75°C, with automatic recovery when temperatures drop below 60°C.
Extended exposure to sub-zero temperatures requires special consideration for optimal performance. When operating at -20°C, the battery maintains 80% of its room-temperature discharge capacity when discharged at 0.2C rate. However, charge acceptance drops significantly below freezing – at 0°C, maximum recommended charge current decreases to 0.3C (12A) to prevent lithium plating. The built-in temperature compensation adjusts charging voltage by -3mV/°C when ambient temperatures exceed 25°C, prolonging electrode stability. Field data from Arctic deployments shows 92% capacity retention after 18 months of daily cycling between -15°C and 20°C.
Expert Views
“The Tenergy 12.8V 40Ah sets a new benchmark for modular lithium solutions. Its PCB-integrated balancing eliminates the need for external BMS in small-scale setups, reducing system costs by 25%. We’ve measured ＞98% Coulombic efficiency under 0.2C loads – exceptional for entry-level commercial batteries.”
– Senior Engineer, Renewable Energy Systems Inc.
FAQ
- Can I replace lead-acid batteries directly with this LiFePO4 pack?
- Yes, but ensure your charging system supports LiFePO4 voltages (14.2-14.6V absorption). Lead-acid chargers may undercharge the battery, reducing capacity utilization by 15-20%.
- What certifications does this battery have?
- The pack meets UL 1642, UN38.3, and IEC 62133 standards. It’s RoHS compliant and includes CE/FCC markings for commercial/industrial use in North America and EU markets.
- How does cold weather affect charging?
- Below 0°C, charge currents should not exceed 0.2C (8A). The PCB automatically disables charging at -20°C to prevent lithium plating. For winter operation, use insulated enclosures maintaining ＞5°C during charging cycles.